On the Ellen
show, Sheryl Crow said that this is what caused her breast cancer.
It has been identified as the most common cause of the high levels
of dioxin in breast cancer tissue.

Sheryl Crow's
oncologist told her: women should not drink bottled water that has
been left in a car. The heat reacts with the chemicals in the plastic
of the bottle which releases dioxin into the water. Dioxin is a toxin
increasingly found in breast cancer tissue. So please be careful and
do not drink bottled water that has been left in a car. Pass this
on to all the women in your life. This information is the kind we
need to know that just might save us! Use a stainless steel canteen
or a glass bottle instead of plastic!